By the 20^th Century, How Had US Schools Designed K-12

By the 20^th century, how had US schools designed K-12 curricula?

A) To guide students in the adolescent maturation process.
B) To equip students with the moral code for good civic engagement as Americans.
C) To prepare each student for competition in the international business market.
D) To offer potential pathways for students, depending on whether they are destined for an academic-based or trade-based career.